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<?php
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/**
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* OAuth consumer using PHP cURL
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* @author Ben Tadiar <ben@handcraftedbyben.co.uk>
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* @link https://github.com/benthedesigner/dropbox
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* @package Dropbox\OAuth
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* @subpackage Consumer
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*/
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class Dropbox_Curl extends Dropbox_ConsumerAbstract
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{
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/**
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* Default cURL options
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* @var array
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*/
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protected $defaultOptions = array(
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CURLOPT_VERBOSE => true,
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CURLOPT_HEADER => true,
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CURLINFO_HEADER_OUT => false,
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CURLOPT_RETURNTRANSFER => true,
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CURLOPT_FOLLOWLOCATION => false,
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);
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/**
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* Store the last response form the API
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* @var mixed
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*/
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protected $lastResponse = null;
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/**
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* Set properties and begin authentication
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* @param string $key
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* @param string $secret
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* @param \Dropbox\OAuth\Consumer\StorageInterface $storage
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* @param string $callback
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*/
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public function __construct($key, $oauth2_id, $secret, Dropbox_StorageInterface $storage, $callback = null, $callbackhome = null, $deauthenticate = false, $instance_id = '')
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{
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// Check the cURL extension is loaded
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if (!extension_loaded('curl')) {
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throw new Dropbox_Exception('The cURL OAuth consumer requires the cURL extension. Please speak to your web hosting provider so that this missing PHP component can be installed.');
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}
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$this->consumerKey = $key;
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$this->oauth2_id = $oauth2_id;
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$this->consumerSecret = $secret;
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$this->storage = $storage;
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$this->callback = $callback;
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$this->callbackhome = $callbackhome;
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$this->instance_id = $instance_id;
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if ($deauthenticate) {
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$this->deauthenticate();
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} else {
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$this->authenticate();
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}
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}
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/**
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* Execute an API call
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* @todo Improve error handling
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* @param string $method The HTTP method
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* @param string $url The API endpoint
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* @param string $call The API method to call
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* @param array $additional Additional parameters
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* @return string|object stdClass
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*/
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public function fetch($method, $url, $call, array $additional = array())
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{
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// Get the signed request URL
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$request = $this->getSignedRequest($method, $url, $call, $additional);
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// Initialise and execute a cURL request
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$handle = curl_init($request['url']);
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// Get the default options array
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$options = $this->defaultOptions;
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if (!UpdraftPlus_Options::get_updraft_option('updraft_ssl_useservercerts')) {
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$options[CURLOPT_CAINFO] = UPDRAFTPLUS_DIR.'/includes/cacert.pem';
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}
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if (UpdraftPlus_Options::get_updraft_option('updraft_ssl_disableverify')) {
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$options[CURLOPT_SSL_VERIFYPEER] = false;
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} else {
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$options[CURLOPT_SSL_VERIFYPEER] = true;
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}
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if (!class_exists('WP_HTTP_Proxy')) require_once(ABSPATH.WPINC.'/class-http.php');
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$proxy = new WP_HTTP_Proxy();
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if ($proxy->is_enabled()) {
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# WP_HTTP_Proxy returns empty strings if nothing is set
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$user = $proxy->username();
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$pass = $proxy->password();
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$host = $proxy->host();
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$port = (int)$proxy->port();
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if (empty($port)) $port = 8080;
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if (!empty($host) && $proxy->send_through_proxy($request['url'])) {
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$options[CURLOPT_PROXY] = $host;
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$options[CURLOPT_PROXYTYPE] = CURLPROXY_HTTP;
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$options[CURLOPT_PROXYPORT] = $port;
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if (!empty($user) && !empty($pass)) {
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$options[CURLOPT_PROXYAUTH] = CURLAUTH_ANY;
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$options[CURLOPT_PROXYUSERPWD] = sprintf('%s:%s', $user, $pass);
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}
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}
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}
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/*
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Add check to see if it's an API v2 call if so then json encode the contents. This is so that it is backwards compatible with API v1 endpoints.
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*/
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if (isset($additional['api_v2']) && !empty($request['postfields'])) {
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$request['postfields'] = json_encode($request['postfields']);
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} elseif (empty($request['postfields'])) {
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// if the postfields are empty then we don't want to send the application/json header if it's set as Dropbox will return an error
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$key = array_search('Content-Type: application/json', $request['headers']);
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if (false !== $key) unset($request['headers'][$key]);
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}
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if (isset($request['headers']) && !empty($request['headers'])) $options[CURLOPT_HTTPHEADER] = $request['headers'];
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if ($method == 'GET' && $this->outFile) { // GET
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$options[CURLOPT_RETURNTRANSFER] = false;
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$options[CURLOPT_HEADER] = false;
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$options[CURLOPT_FILE] = $this->outFile;
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$options[CURLOPT_BINARYTRANSFER] = true;
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$options[CURLOPT_FAILONERROR] = true;
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$this->outFile = null;
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} elseif ($method == 'POST' && $this->outFile) { // POST
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$options[CURLOPT_POST] = true;
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$options[CURLOPT_RETURNTRANSFER] = false;
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$options[CURLOPT_HEADER] = false;
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$options[CURLOPT_FILE] = $this->outFile;
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$options[CURLOPT_BINARYTRANSFER] = true;
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$options[CURLOPT_FAILONERROR] = true;
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$this->outFile = null;
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} elseif ($method == 'POST' && $this->inFile) { // POST
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$options[CURLOPT_POST] = true;
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$options[CURLOPT_POSTFIELDS] = $this->inFile;
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} elseif ($method == 'POST') { // POST
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$options[CURLOPT_POST] = true;
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$options[CURLOPT_POSTFIELDS] = $request['postfields'];
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} elseif ($method == 'PUT' && $this->inFile) { // PUT
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$options[CURLOPT_PUT] = true;
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$options[CURLOPT_INFILE] = $this->inFile;
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// @todo Update so the data is not loaded into memory to get its size
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$options[CURLOPT_INFILESIZE] = strlen(stream_get_contents($this->inFile));
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fseek($this->inFile, 0);
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$this->inFile = null;
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}
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if (isset($additional['timeout'])) {
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$options[CURLOPT_TIMEOUT] = $additional['timeout'];
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}
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// Set the cURL options at once
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curl_setopt_array($handle, $options);
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// Execute, get any error and close
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$response = curl_exec($handle);
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$error = curl_error($handle);
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$getinfo = curl_getinfo($handle);
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curl_close($handle);
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//Check if a cURL error has occured
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if ($response === false) {
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throw new Dropbox_CurlException($error);
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} else {
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// Parse the response if it is a string
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if (is_string($response)) {
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$response = $this->parse($response);
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}
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// Set the last response
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$this->lastResponse = $response;
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$code = (!empty($response['code'])) ? $response['code'] : $getinfo['http_code'];
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// The API doesn't return an error message for the 304 status code...
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// 304's are only returned when the path supplied during metadata calls has not been modified
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if ($code == 304) {
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$response['body'] = new stdClass;
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$response['body']->error = 'The folder contents have not changed';
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}
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// Check if an error occurred and throw an Exception
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if (!empty($response['body']->error) || $code >= 400) {
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// Dropbox returns error messages inconsistently...
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if (!empty($response['body']->error) && $response['body']->error instanceof stdClass) {
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$array = array_values((array) $response['body']->error);
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//Dropbox API v2 only throws 409 errors if this error is a incorrect_offset then we need the entire error array not just the message. PHP Exception messages have to be a string so JSON encode the array.
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if (strpos($array[0] , 'incorrect_offset') !== false) {
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$message = json_encode($array);
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} elseif (strpos($array[0] , 'lookup_failed') !== false ) {
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//re-structure the array so it is correctly formatted for API
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//Note: Dropbox v2 returns different errors at different stages hence this fix
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$correctOffset = array(
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'0' => $array[1]->{'.tag'},
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'1' => $array[1]->correct_offset
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);
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$message = json_encode($correctOffset);
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} else {
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$message = $array[0];
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}
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} elseif (!empty($response['body']->error)) {
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$message = $response['body']->error;
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} elseif (is_string($response['body'])) {
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// 31 Mar 2017 - This case has been found to exist; though the docs imply that there's always an 'error' property and that what is returned in JSON, we found a case of this being returned just as a simple string, but detectable via an HTTP 400: Error in call to API function "files/upload_session/append_v2": HTTP header "Dropbox-API-Arg": cursor.offset: expected integer, got string
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$message = $response['body'];
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} else {
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$message = "HTTP bad response code: $code";
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}
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// Throw an Exception with the appropriate with the appropriate message and code
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switch ($code) {
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case 304:
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throw new Dropbox_NotModifiedException($message, 304);
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case 400:
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throw new Dropbox_BadRequestException($message, 400);
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case 404:
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throw new Dropbox_NotFoundException($message, 404);
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case 406:
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throw new Dropbox_NotAcceptableException($message, 406);
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case 415:
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throw new Dropbox_UnsupportedMediaTypeException($message, 415);
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case 401:
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//401 means oauth token is expired continue to manually handle the exception depending on the situation
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break;
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case 409:
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//409 in API V2 every error will return with a 409 to find out what the error is the error description should be checked.
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throw new Dropbox_Exception($message, $code);
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default:
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throw new Dropbox_Exception($message, $code);
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}
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}
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return $response;
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}
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}
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/**
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* Parse a cURL response
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* @param string $response
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* @return array
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*/
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private function parse($response)
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{
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// Explode the response into headers and body parts (separated by double EOL)
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list($headers, $response) = explode("\r\n\r\n", $response, 2);
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// Explode response headers
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$lines = explode("\r\n", $headers);
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// If the status code is 100, the API server must send a final response
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// We need to explode the response again to get the actual response
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if (preg_match('#^HTTP/[\.\d]+ 100#i', $lines[0])) {
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list($headers, $response) = explode("\r\n\r\n", $response, 2);
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$lines = explode("\r\n", $headers);
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}
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// Get the HTTP response code from the first line
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$first = array_shift($lines);
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$pattern = '#^HTTP/[\.\d]+ ([0-9]{3})#i';
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preg_match($pattern, $first, $matches);
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$code = $matches[1];
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// Parse the remaining headers into an associative array
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$headers = array();
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foreach ($lines as $line) {
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list($k, $v) = explode(': ', $line, 2);
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$headers[strtolower($k)] = $v;
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}
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// If the response body is not a JSON encoded string
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// we'll return the entire response body
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if (!$body = json_decode($response)) {
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$body = $response;
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}
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if (is_string($body)) {
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$body_lines = explode("\r\n", $body);
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if (preg_match('#^HTTP/[\.\d]+ 100#i', $body_lines[0]) && preg_match('#^HTTP/\d#i', $body_lines[2])) {
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return $this->parse($body);
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}
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}
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return array('code' => $code, 'body' => $body, 'headers' => $headers);
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}
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/**
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* Return the response for the last API request
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* @return mixed
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*/
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public function getlastResponse()
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{
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return $this->lastResponse;
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}
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}
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